Metal Hydroxide Precipitates + Non Metal Ions Flashcards by Mayowa O | Brainscape

Q

What does a blue precipitate in sodium hydroxide solution indicate?

A

Copper (II) ions present

Cu(NO3)2 + 2NaOH —- 2NaNO3 + Cu(OH)2

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Q

What does a green precipitate in sodium hydroxide solution indicate?

A

Iron (II) ion is present

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Q

What does a brown precipitate in sodium hydroxide solution indicate?

A

Iron (III) ions are present

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Q

Which three ions form white precipitates when reacted with sodium hydroxide>

A

Magnesium, Calcium and Aluminium (app zinc idk)

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Q

Which three ions form white precipitates when reacted with sodium hydroxide>

A

Magnesium, Calcium and Aluminium (app zinc idk)

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Q

Which three ions form white precipitates when reacted with sodium hydroxide>

A

Magnesium, Calcium and Aluminium (app zinc idk)

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Q

Which three ions form white precipitates when reacted with sodium hydroxide>

A

Magnesium, Calcium and Aluminium (app zinc idk)

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Q

Which three ions form white precipitates when reacted with sodium hydroxide>

A

Magnesium, Calcium and Aluminium (app zinc idk)

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Q

Which three ions form white precipitates when reacted with sodium hydroxide>

A

Magnesium, Calcium and Aluminium (app zinc idk)

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Q

Describe how to distinguish between Mg, Al and Ca ions after reacting with sodium hydroxide solution

A

Solution containing aluminium will turn colourless when excess sodium hydroxide is added, as the aluminium dissolves.

(Flame tests to figure out which one is calcium)

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Q

Describe how to test for carbonate ions and carbon dioxide

A

Add dilute nitric acid to the sample
If carbonates are present, the acid reacts with the carbonate to make carbon dioxide gas
Bubble the gas through limewater
If limewater turns milky, CO2 is present

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Q

Describe how to test for the presence of Chlorine, Bromine and Iodine ions

A

Add dilute nitric acid to solution
Add acidified silver nitrate to solution
Cl - white precipitate
Br - Cream precipitate
I - yellow precipitate

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Q

Describe how to test for the presence of sulfate ions

A

Add dilute HCL to the sample
Add barium chloride to sample
If sulfate is present, a white precipitate is formed

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Q

Explain why in a test for halides, the sample is acidified with dilute nitric acid first

A

Carbonate ions also produce a white precipitate with silver nitrate solution. The acid reacts with any carbonate ions present. This removes them, so stopping them giving an incorrect positive result for chloride ions.

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Q

Why are acids added to non metal solutions before testing?

A

They react with and remove carbonates

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